Baseline distribution of sociodemographic characteristics of participants in the New Zealand Blood Donors' Health Study
| Characteristic | No (%) |
|---|---|
| *Participants could be in more than one category; †occupationally derived index applied to participants in paid employment providing sufficient description regarding their job. Class 1 represents the highest socioeconomic group.39 | |
| Sex | |
| Male | 12012 (53.7) |
| Female | 10377 (46.3) |
| Age (years) | |
| 16–24 | 8040 (35.9) |
| 25–39 | 5305 (23.7) |
| 40+ | 9044 (40.4) |
| Range 16–84; mean 35; median 34; SD 15 | |
| Ethnicity | |
| Maori | 1817 (8.1) |
| Pacific Islands | 1040 (4.7) |
| Asian | 975 (4.4) |
| European/Pakeha | 17457 (78.0) |
| Other | 322 (1.4) |
| Missing | 778 (3.5) |
| Marital status | |
| Married/living in stable relationship | 10750 (48.0) |
| Divorced/separated | 1372 (6.2) |
| Widowed | 304 (1.3) |
| Never married | 9259 (41.4) |
| Other (combinations of above) | 61 (0.2) |
| Missing | 643 (2.9) |
| Employment* | |
| In paid employment | 13404 (59.9) |
| Homemaker | 2357 (10.5) |
| Student | 6246 (27.9) |
| Retired | 827 (3.7) |
| Unemployed | 605 (2.7) |
| Other | 1035 (4.6) |
| New Zealand socioeconomic index score† | |
| 1 (76–90) | 1542 (12.2) |
| 2 (61–75) | 1698 (13.4) |
| 3 (51–60) | 2909 (23.0) |
| 4 (41–50) | 3470 (27.4) |
| 5 (31–40) | 2513 (19.8) |
| 6 (10–30) | 531 (4.2) |
| Range 10–90; mean 50; median 54; SD 15 | |